Today El Salvador is 40% in profit in their bitcoin investment as bitcoin price keeps rising, 40% when the halving has yet occured, and the next ATH not yet hit, how much more when it all does.
This is paper profit. I have not heard of El Salvador selling this holding bitcoins and taking a profit. And if the bitcoin's price falls (and this often happens in a very volatile cryptomarket) by the same 40%, will it turn out that El Salvador received losses or not? 
I think all bitcoin investors needs to take a leaf and learn from Bukele's firmness and resolve to HODLing even under strong press, criticism from the so-called experts. Today everyone is praising him for for holding firm.
Remember this; bitcoin will always silent the critics, our role is to just hold patiently strong.
It is clear that the example you gave should encourage BTC-holders to show perseverance in holding bitcoin, but in the case of El Salvador, there is not much time in the past to evaluate the correctness of President Bukele s decision. This story is still far from over and it is unknown how the choice made by the president will affect the fate of the entire country and its inhabitants. This is a very big responsibility. It’s completely different from what happens with individual investing.Remember this; bitcoin will always silent the critics, our role is to just hold patiently strong.